from datetime import datetime, timezone
from typing import Optional

from flask import Blueprint, Response, current_app, flash, render_template
from flask.typing import ResponseReturnValue
from flask_wtf import FlaskForm
from sqlalchemy import desc, exc
from wtforms import BooleanField, SubmitField

from app.extensions import db
from app.models.automation import Automation, AutomationLogs
from app.models.tfstate import TerraformState
from app.portal.util import response_404, view_lifecycle

bp = Blueprint("automation", __name__)


_SECTION_TEMPLATE_VARS = {
    "section": "automation",
    "help_url": "https://bypass.censorship.guide/user/automation.html",
}


class EditAutomationForm(FlaskForm):  # type: ignore
    enabled = BooleanField("Enabled")
    submit = SubmitField("Save Changes")


@bp.route("/list")
def automation_list() -> ResponseReturnValue:
    automations = list(
        filter(
            lambda a: a.short_name
            not in current_app.config.get("HIDDEN_AUTOMATIONS", []),
            Automation.query.filter(Automation.destroyed.is_(None))
            .order_by(Automation.description)
            .all(),
        )
    )
    states = {tfs.key: tfs for tfs in TerraformState.query.all()}
    return render_template(
        "list.html.j2",
        title="Automation Jobs",
        item="automation",
        items=automations,
        states=states,
        **_SECTION_TEMPLATE_VARS
    )


@bp.route("/edit/<automation_id>", methods=["GET", "POST"])
def automation_edit(automation_id: int) -> ResponseReturnValue:
    automation: Optional[Automation] = Automation.query.filter(
        Automation.id == automation_id
    ).first()
    if automation is None:
        return Response(
            render_template(
                "error.html.j2",
                header="404 Automation Job Not Found",
                message="The requested automation job could not be found.",
                **_SECTION_TEMPLATE_VARS
            ),
            status=404,
        )
    form = EditAutomationForm(enabled=automation.enabled)
    if form.validate_on_submit():
        automation.enabled = form.enabled.data
        automation.updated = datetime.now(tz=timezone.utc)
        try:
            db.session.commit()
            flash("Saved changes to bridge configuration.", "success")
        except exc.SQLAlchemyError:
            flash(
                "An error occurred saving the changes to the bridge configuration.",
                "danger",
            )
    logs = (
        AutomationLogs.query.filter(AutomationLogs.automation_id == automation.id)
        .order_by(desc(AutomationLogs.added))
        .limit(5)
        .all()
    )
    return render_template(
        "automation.html.j2",
        automation=automation,
        logs=logs,
        form=form,
        **_SECTION_TEMPLATE_VARS
    )


@bp.route("/kick/<automation_id>", methods=["GET", "POST"])
def automation_kick(automation_id: int) -> ResponseReturnValue:
    automation = Automation.query.filter(
        Automation.id == automation_id, Automation.destroyed.is_(None)
    ).first()
    if automation is None:
        return response_404("The requested bridge configuration could not be found.")
    return view_lifecycle(
        header="Kick automation timer?",
        message=automation.description,
        section="automation",
        success_view="portal.automation.automation_list",
        success_message="This automation job will next run within 1 minute.",
        resource=automation,
        action="kick",
    )